ok i just wanna ask a simple question what would make a built 48re when you hit the passing gear go from instead of third it goes to second gear for about a second or two then back to third like it should ?im sorry one more questionlo. also in the lower rpms the rpms are revving up just a hair the revving back down like the torque converter is locking and unlocking?

 

Called shift shuttle, I think.
DTT sells a shift enhancer, has
something to do with line pressure.

 

Thanks man. Any other tranny gurus got any ideas